We utilize the anomalous dispersion of planar photonic crystals near the dielectric band edge to control the wavelength-dependent propagation of light. We typically observe an angular swing of up to 10°as the inp...We utilize the anomalous dispersion of planar photonic crystals near the dielectric band edge to control the wavelength-dependent propagation of light. We typically observe an angular swing of up to 10°as the input wavelength is changed from 1290 nm to 1310 rim, which signifies an angular dispersion of 0.5°/am （＂Superprism＂ phenomenon）. Such a strong angular dispersion is of the order required for WDM systems. By tuning the incident angle, light beams with up to 20° divergence were collimated over a 25 nm （1285 nm to 1310 nm） bandwidth using a triangular lattice （＂Supercollimator＂ phenomenon）. The wavelength collimating range can be extended from 25 nm to 40 nm by changing the lattice from triangular to square. These two devices can be realized in the same configuration, simply by tuning the wavelength. Sources of loss are discussed.展开更多
棱镜是空间和军用白光、红外光学系统中的关键元件之一,能够在光学系统中实现更高精度的成像质量,故提出了超高精度棱镜的加工和检测技术。首先,分析了适用于棱镜加工的工装材料及加工方法,指出了超高精度棱镜加工的难点和关键点.然后,...棱镜是空间和军用白光、红外光学系统中的关键元件之一,能够在光学系统中实现更高精度的成像质量,故提出了超高精度棱镜的加工和检测技术。首先,分析了适用于棱镜加工的工装材料及加工方法,指出了超高精度棱镜加工的难点和关键点.然后,介绍了超高精度棱镜加工的工装制作、棱镜粘接、加工、检测方法,以及预防损害棱镜工装的防护措施。最后,通过加工总高为35~95mm的施密特硒化锌棱镜,用Zygo干涉仪进行面形检测,其面形精度达到RMS 0.007μm(λ=632.8nm);用精密测角仪Pris mm aster C2000进行角度检测,其第一光学平行差小于1″;用XQ20-GI平面激光干涉仪检测第二光学平行差为1.048″;用原子力显微镜检测表面粗糙度为2.9nm。展开更多
文摘We utilize the anomalous dispersion of planar photonic crystals near the dielectric band edge to control the wavelength-dependent propagation of light. We typically observe an angular swing of up to 10°as the input wavelength is changed from 1290 nm to 1310 rim, which signifies an angular dispersion of 0.5°/am （＂Superprism＂ phenomenon）. Such a strong angular dispersion is of the order required for WDM systems. By tuning the incident angle, light beams with up to 20° divergence were collimated over a 25 nm （1285 nm to 1310 nm） bandwidth using a triangular lattice （＂Supercollimator＂ phenomenon）. The wavelength collimating range can be extended from 25 nm to 40 nm by changing the lattice from triangular to square. These two devices can be realized in the same configuration, simply by tuning the wavelength. Sources of loss are discussed.
文摘棱镜是空间和军用白光、红外光学系统中的关键元件之一,能够在光学系统中实现更高精度的成像质量,故提出了超高精度棱镜的加工和检测技术。首先,分析了适用于棱镜加工的工装材料及加工方法,指出了超高精度棱镜加工的难点和关键点.然后,介绍了超高精度棱镜加工的工装制作、棱镜粘接、加工、检测方法,以及预防损害棱镜工装的防护措施。最后,通过加工总高为35~95mm的施密特硒化锌棱镜,用Zygo干涉仪进行面形检测,其面形精度达到RMS 0.007μm(λ=632.8nm);用精密测角仪Pris mm aster C2000进行角度检测,其第一光学平行差小于1″;用XQ20-GI平面激光干涉仪检测第二光学平行差为1.048″;用原子力显微镜检测表面粗糙度为2.9nm。
